Joshua stevens



(No Model.)

J. STEVENS.

GALIPERS 0R DIVIDERS.

No. 432,578. Patented July 22, 1890.

INVENTOR:

WTNESS S: X KW By his Aftol lzeys. $1M, X -MM QQ UNITED STATES 'PATTNTOFFICE.

JOSHUA STEVENS, OF CHICOPEE FALLS, MASSACHUSETTS, ASSIGNOR TO THE J.STEVENS ARMS AND TOOL COMPANY, OF SAME PLACE.

CALI PERS OR DIV! DERS.

SPECIFICATION formingpart of Letters Patent No. 432,578, dated July 22,1890.

Application filed December 20, 1889. Serial No. 334,431. (No model.)

To all whom it may concern: in order that they may be clamped togetherBe it known that I, JOSHUA STEVENS, a eitiat any angle. One end of thiswing is formed zen of the United States, residing at Chicopee as acylindrical stem Z), which is screw- Falls, in the State ofMassachusetts, have inthreaded, and which passes freely through a ventedcertain new and useful Improvements round hole drilled through the legA. A

in Calipers or Dividers, of which the following recess 0 is formed inthis leg, in which fits is a specification. closely a disk-shapedthumb-nut F, the in- This invention relates to dividers or caliternalthreads of which engage the threads pers of that class wherein the legsare conon the stem 1), as best shown in Figs. 2 and 4,

1o nected through the medium of an arc-shaped and tl1e.milled peripheryof which projects brace of wing attached to one of the legs, and beyondthe opposite sides of the leg suffito which the other may be clamped inany eiently to enable the nut to be turned by the position in order toset the legs firmly when lingers. The end of the screw-stem bprojectsopened to any desired extent. entirely through and beyond the leg A, and

r 5 The object of the invention is to improve on its projecting portionis screwed a set-nut the construction of such calipers with special G.On the extreme end of the stem is fixed reference to the adjustableconnection of the a button or head (I, which prevents the escape wing tothe leg to which its end is fastened. of the nut G.

Figure 1 of the accompanying drawings is The are-shaped portion of thewing E is 20 an elevation of dividers or calipers embodymade flat, andpasses through a recess or slot ing my invention. Fig. 2 is a similarview out in the leg A. This leg is provided with partly in section; Fig.3 is a fragmentary any suitable means for clamping it to the side oredge view of the upper portion of the wing-such, for example, as aset-screw c, act dividers. Fig. atisatransverse section thereof ingagainst a gib f, as shown in Fig. 4-this 2 5 cut parallel to thearc-shaped wing. being awell-known expedientfor the purpose.

The two legs A A of the dividers or cali- In order to setthe dividers orcalipers to any pers are pivoted together at the head B in any givenn'ieasurement, the screw 8 is loosened known or suitable way, and areprovided with and the legs opened or closed to approxipoints in the easeof dividers,or with curved mately the proper relative position, where-30 or other jaws in case the instrument is ealiupon they are set bytightening the screw e. pers, according to any known method of con- Anyfine adjustment necessary is afterward struction. Preferably separatepoints C C made by first loosening the set-nut G and then are employedfor dividers, the legs A A being turning the nut F, in order thereby topropel made tubular and the shanks of these points the screw 1) in onedirection or the other 5 thrust into them and fastened by clamps orthrough its hole in the leg A, and thereby set-screws'a a, as shown inFig. 2; or curved to move this leg toward or from the leg A.caliper-jaws C may be substituted for the hen the required adjustmenthas been obdivider-points. To lengthen the instrument, tained, the set-nut G is screwed up, in order a tubular sleeve D may be applied to eachleg to take up any possible looseness or lost mo 40 by slipping'i'rs oneend over one of the points tion.

C and clamping it thereon by a clamp or set- My invention provides avery simple conscrew a, and thrusting a caliper-leg C or a struction forsecuring the coarse and fine addivider-point or other usual accessory ofsuch 'justment, 4 e dividers or calipers, and one instruments into theother end of the sleeve which i so from springs or elastic eonnec- 5 andfastening it by a clamp a, as shown tions org-any kind, and can beadjusted with with reference to the right-hand leg in Fig. 1. greatnicety and in a firm and unyielding 5 These details, however, areimmaterial to my manner-to any measurement. invention. I claim as myinvention the following de- An arc-shaped or straight brace or wingfined novel features, substantially as herein- 50 E is provided toconnect the two legs A A, before specified, namely:

IOC

shaped wing E, having a screw-threaded end Z), passing through said holein the -leg A, a v

thumb-nut F, working in said recess 0 and engaging said threadedend, aset-nut G, 15

screwing on said threaded end against the leg A, and means for clampingthe leg A to the wing.

In witness whereof I have hereunto signed l my name in the presence oftwo subscribing 2o 1 witnesses.

JOSHUA STEVENS.

! Witnesses:

JAMES IT. LooMIs,

GEORGIE E. PAGE.

